GB/T 2978-2024 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 2978-2024 | English | 740 |
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Size designation, dimensions, inflation pressure and load capacity for passenger car tyres
| Valid |
| GB/T 2978-2014 | English | 145 |
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Size designation, dimensions, inflation pressure and load capacity for passenger car tyres
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| GB/T 2978-2008 | English | 150 |
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Size designation, dimensions, inflation pressure and load capacity for passenger car tyres
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| GB/T 2978-1997 | English | 639 |
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Series of passenger car tyres
| Obsolete |
| GB/T 2978-1989 | English | RFQ |
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Series of passenger car tyres
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GB/T 2978-2024: Size designation, dimensions, inflation pressure and load capacity for passenger car tyres
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2978-2024
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 83.160.10
CCS G 41
Replacing GB/T 2978-2014
Size designation, dimensions, inflation pressure and load
capacity for passenger car tyres
Issued on: SEPTEMBER 29, 2024
Implemented on: APRIL 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Indication of tyre sizes... 6
5 Tyre sizes, dimensions, inflation pressure and load capacity... 7
6 Valve... 47
Appendix A (Normative) Correspondence between load index and load capacity
... 49
Appendix B (Normative) Correspondence between speed symbols and
maximum driving speeds... 50
Appendix C (Normative) Calculation and rounding regulations of maximum and
minimum peripheral dimensions of new tyres... 51
Table 1 -- 80 series passenger car radial tyres... 9
Table 2 -- 75 series passenger car radial tyres... 11
Table 3 -- 70 series passenger car radial tyres... 12
Table 4 -- 65 series passenger car radial tyres... 14
Table 5 -- 60 series passenger car radial tyres... 16
Table 6 -- 55 series passenger car radial tyres... 19
Table 7 -- 50 series passenger car radial tyres... 21
Table 8 -- 45 series passenger car radial tyres... 24
Table 9 -- 40 series passenger car radial tyres... 27
Table 10 -- 35 series passenger car radial tyres... 29
Table 11 -- 30 series passenger car radial tyres... 32
Table 12 -- 25 series passenger car radial tyres... 35
Table 13 -- High load (HLa) passenger car radial tyres... 37
Table 14 -- T-type temporary-use spare tyres... 38
Table 15 -- Reserved old series of passenger car radial tyres a... 42
Table 16 -- Correspondence between load capacity and inflation pressure of
standard passenger car radial tyres... 42
Table 17 -- Correspondence between load capacity and inflation pressure of
reinforced passenger car radial tyres... 44
Table 18 -- Adjustment method for the minimum inflation pressure of radial tyres
of passenger cars when the driving speed exceeds 160 km/h... 46
Table 19 -- Percentage change in load capacity of passenger car tyres when
the driving speed exceeds 210 km/h... 47
Table 20 -- Passenger car tyre valve models... 48
Table A.1 -- Correspondence between load index and load capacity... 49
Table B.1 -- Correspondence between speed symbols and maximum driving
speeds... 50
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document replaces GB/T 2978-2014 Size designation, dimensions, inflation
pressure and load capacity for passenger car tyres. Compared with GB/T 2978-2014,
in addition to structural adjustments and editorial changes, the main technical changes
are as follows.
-- The marking requirements for high-load passenger car radial tyres are added, and
the tyre types that need to be marked with "RF" or "ZRF" are changed to quote
the relevant provisions of GB/T 30196-2022 (see Chapter 4; see Chapter 4 of
the 2014 edition);
-- The reserved old series of passenger car diagonal tyres are deleted (see Chapter
4 and Table 15 of the 2014 edition);
-- Some sizes of radial tyres for passenger cars are added (see Tables 1~12 and
Table 14);
-- The reinforced load index and load capacity of some sizes are added (see Table
1, Tables 3~9, and Table 11; see Table 1, Tables 3~9, and Table 11 of the 2014
edition);
-- The standard load index and load capacity of some sizes are added (see Tables
6~9, and Table 11; see Tables 6~9, and Table 11 of the 2014 edition);
-- Some data parameters of some sizes are modified (see Tables 1~12, and Table
14; see Tables 1~13 of the 2014 edition);
-- High-load passenger car radial tyres are added (see Table 13);
-- The light-load type is added to some sizes of T-type spare tyres for temporary
use (see Table 14; see Table 13 of the 2014 edition);
-- The requirements for the measuring rim and permitted rim of T-type spare tyres
are added (see Table 14; see Table 13 of the 2014 edition);
-- The requirements for inflation pressure are modified and specified (see 5.5; see
5.5 of the 2014 edition);
-- The correspondence between some speed symbols and maximum speeds are
deleted (see Table B.1; see Table B.1 of the 2014 edition);
-- The calculation and rounding provisions for the maximum and minimum
peripheral dimensions of new tyres are added (see Appendix C).
Please note that some of the contents of this document may involve patents. The issuing
organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Tyres
and Rims of Standardization Administration of China (SAC/TC19).
Drafting organizations of this document. Triangle Tyre Co., Ltd., Wanli Tire Co., Ltd.,
Zhongce Rubber Group Co., Ltd., Shandong Linglong Tyre Co., Ltd., Cheng Shin
Rubber (Xiamen) Ind., Ltd., Sailun Tire Americas Inc., Doublestar Group Co., Ltd.,
Beijing Research & Design Institute of Rubber Industry Co., Ltd., Prinx Chengshan
(Shandong) Tire Co., Ltd., Sichuan Tire Rubber (Group) Co., Ltd., Giti Radial Tire
(Anhui) Co., Ltd., Qingdao Sentury Tire Co., Ltd., Double Coin Tire Group Co., Ltd.,
Shandong Fengyuan Tire Manufacturing Co., Ltd., Shandong Changfeng Tire Co., Ltd.,
Shandong Xinghongyuan Tire Co., Ltd., Sichuan Yuanxing Rubber Co., Ltd., Tianjin
Wanda Tyre Group Co., Ltd., Shandong Province Sanli Tire Manufacture Co., Ltd.,
Tercelo Tire Group Co., Ltd., Shandong Hongsheng Rubber Technology Co., Ltd.,
Shandong Jinyu Tyre Co., Ltd., Pirelli Tyre Co., Ltd., Goodyear Dalian Tire Co., Ltd.,
Michelin (China) Investment Co., Ltd., Hankook Tire China Co., Ltd., Yokohama
Rubber (China) Co., Ltd., Bridgestone (China) Investment Co., Ltd., Sumitomo Rubber
(China) Co., Ltd., SAIC-GM-Wuling Automobile Co., Ltd., Anhui Deji Automobile
Inspection Center Co., Ltd., and TUV NORD (Hangzhou) Co., Ltd.
Main drafters of this document. Wang Dapeng, Yu Baolin, Zhou Qiong, Zhang Dian,
Wang Xiumei, Chen Jianming, Tian Zongbo, Xu Wei, Mou Shouyong, Xu Lihong,
Wang Yan, Luo Jiangang, Chen Yun, Qin Jingbo, Hao Yunnan, Zheng Tao, Pan Wen,
Zhu Zuoyong, Cui Youming, Yu Zhenjiang, Yang Hongtao, Gao Jiangang, Zhang
Yuliang, Yang Wanlong, Niu Fuxiang, Yin Qingye, Zhou Ling, Liu Qingjie, Wang
Zhenxiao, Zhu Cheng, Zhang Bin, Huang Yuanyi, He Pengchun, Yu Heng, Li Shuhuan,
Zheng Rui, and Li Miaomiao.
The previous versions of the standards replaced by this document are as follows.
-- First published in 1982 as GB/T 2978-1982 Series of passenger car tyres; first
revised in 1989; second revised in 1997;
-- The third revision was made in 2008, and the name of the standard was changed
to "Size designation, dimensions, inflation pressure and load capacity for
passenger car tyres";
-- The fourth revision was made in 2014; this is the fifth revision.
Size designation, dimensions, inflation pressure and load
capacity for passenger car tyres
1 Scope
This document specifies the method of expressing passenger car tyre sizes, tyre sizes
and corresponding dimensions, inflation pressure and load capacity, as well as related
requirements.
This document applies to new pneumatic passenger car tyres.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 6326 Tyre - Vocabulary
GB/T 30196-2022 Self-supporting run flat tyres
3 Terms and definitions
The terms and definitions defined in GB/T 6326 apply to this document.
4 Indication of tyre sizes
The following is an example of the size of a passenger car tyre.
Reinforced tyres shall have the load identification mark "EXTRA LOAD (or XL)" or
"REINFORCED (or REINF)".
High-load passenger car radial tyres are reinforced tyres and shall also be given the
specification prefix "HL", for example. HL185/70R13.
For tyres with a maximum speed exceeding 240 km/h and not exceeding 300 km/h (with
W or Y speed symbols marked on the tyres), the structural type code can replace "R"
with "ZR".
For tyres with speeds exceeding 300 km/h, the structural type code shall replace "R"
with "ZR", and the instructions for use shall be composed of the speed symbol "Y" and
the corresponding load index in brackets, for example, 245/45ZR17 (95Y). The actual
maximum load capacity and speed capacity of the tyre shall be stated in the tyre
manufacturer's technical documentation.
For tyres that meet the requirements of Class I self-supporting run-flat tyres in GB/T
30196-2022, an "F" shall be marked after the structural type code for identification, for
example. 225/45RF17 or 225/45ZRF17.
T-type temporary-use spare tyres shall be marked with the additional specification mark
"T", for example, T135/90D16.
5 Tyre sizes, dimensions, inflation pressure and load capacity
5.1 The size, load index and corresponding load capacity and inflation pressure,
Tyre size markings Instructions
Speed symbol
Load index
Nominal rim diameter code
Structural type code ("R" is the radial tyre code,
"-" or "D" is the diagonal tyre code)
Nominal aspect ratio
Nominal section width (mm)
measuring rim and new tyre dimension of passenger car tyres shall comply with the
provisions of Table 1~Table 15; the maximum use size, static loaded radius, rolling
radius and permitted rim of tyres should comply with the provisions of Table 1~Table
15.
5.2 When the driving speed is 160 km/h or below, the corresponding relationship
between the load capacity of standard and reinforced passenger car radial tyres at
different inflation pressures shall comply with the provisions of Table 16 and Table 17,
respectively.
5.3 The corresponding relationship between load index and load capacity shall comply
with the provisions of Appendix A.
5.4 The correspondence between speed symbols and maximum driving speeds shall
comply with the provisions of Appendix B.
5.5 The inflation pressure mentioned in this document refers to the inflation pressure of
the tyre at normal temperature and cold state, and does not include the increased
pressure caused by temperature rise during driving.
In any case, to ensure safety, the inflation pressure of the T-type temporary-use spare
tyre is 420 kPa, and the inflation pressure of other passenger car radial tyres shall not
be greater than 350 kPa.
Under normal use, the inflation pressure of high-load tyres shall not be lower than 200
kPa at any speed. The inflation pressure of other passenger car radial tyres shall not be
lower than 140 kPa when the driving speed is ≤160 km/h, and shall not be lower than
180 kPa when the driving speed is >160 km/h. In special use cases, please consult with
the tyre manufacturer.
Appendix A
(Normative)
Correspondence between load index and load capacity
When the driving speed is 210 km/h or below, the corresponding relationship between
load index and load capacity shall comply with the provisions of Table A.1.
Appendix B
(Normative)
Correspondence between speed symbols and maximum driving
speeds
The correspondence between speed symbols and maximum driving speeds shall comply
with the provisions of Table B.1.
Appendix C
(Normative)
Calculation and rounding regulations of maximum and
minimum peripheral dimensions of new tyres
C.1 Maximum and minimum overall width of a new tyre
The maximum and minimum overall widths of a passenger car tyre shall be calculated
according to the formulas specified in Table 1 and Table 14, and the results shall be
rounded off to the nearest integer in millimeters.
C.2 Maximum and minimum overall diameter of a new tyre
To calculate the maximum and minimum overall diameters of a passenger car tyre, first
round off the calculation result of the new tyre design section height to the nearest
integer millimeter, then round off the calculation result of "new tyre design section
height × coefficient" to the nearest integer millimeter, and calculate according to the
formulas specified in Table 1 and Table 14.
For snow tyres, mud and snow tyres and special use tyres, the maximum overall
diameter of a new tyre and the maximum overall diameter in service can be increased
by 1%, and the calculated results shall be rounded off to the nearest integer in
millimeters.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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